Overview
The ZF 4646.205.012 OUTPUT FLANGE is a critical driveline component engineered for the WG250 series transmission. This OEM genuine part serves as the mechanical interface between the transmission output shaft and the propeller shaft or drive axle, transferring rotational torque from the gearset to the vehicle’s driveline. Machined from high-strength alloy steel, the flange features a precision splined bore that mates directly to the output shaft, while its bolt pattern secures the companion flange or yoke. The SKU 4646.205.012 is the definitive ZF reference for this component, ensuring exact fitment and load-bearing capacity within the WG250 assembly.
Symptoms of Failure
When the ZF 4646.205.012 OUTPUT FLANGE begins to wear, operators may notice these specific failure indicators:
- Oil leaks at the output shaft seal area – A worn flange bore or damaged sealing surface allows transmission fluid to escape, often visible as drips beneath the bell housing.
- Vibration during acceleration or deceleration – Excessive spline wear or flange runout creates driveline imbalance, felt as a shudder through the chassis at specific RPM ranges.
- Clunking noise when shifting gears – Loose fitment between the flange splines and output shaft produces audible metallic impact sounds during torque reversals.
- Premature bearing or seal failure – A distorted flange face misaligns the output shaft, accelerating wear on the TRANSMISSION HOUSING and internal bearings.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.205.012 |
| OEM Reference | ZF 4646.205.012 |
| Material | Alloy Steel (40Cr / 42CrMo4 equivalent) |
| Weight | 2.85 kg (6.28 lbs) |
| Outer Diameter | 180 mm |
| Bolt Circle Diameter | 150 mm |
| Spline Count | 14-tooth involute spline |
| Surface Treatment | Phosphate coating / Black oxide |
| Torque Capacity | 2,500 Nm (estimated) |
Compatibility
This OUTPUT FLANGE is designed for the ZF WG250 transmission series, but it also fits select models within the WG family. Based on spline dimensions and bolt patterns, the 4646.205.012 is compatible with:
- ZF WG180
- ZF WG200
- ZF WG250
- ZF WG300 (with adapter verification)
Installation requires precise alignment with the HOUSING and the COVER assembly. Secure the flange using the specified HEXAGON SCREW fasteners torqued to factory specifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101066 | TRANSMISSION HOUSING | Encloses gearset and supports shafts |
| 4646301228 | HOUSING | Rear housing section for output assembly |
| 4646301251 | COVER | Seals rear housing and retains bearings |
| 0636015304 | HEXAGON SCREW | Fastens flange to output shaft |
| 0636101828 | CAP SCREW | Secures cover to housing |
| 4646301100 | COVER SHEET | Gasket/seal for housing interface |
| 4646301217 | COVER SHEET | Secondary sealing plate |
| 4646201007 | SCREEN SHEET | Filter mesh for oil circulation |
| 0730365125 | TYPE PLATE | Identification label for transmission |
| 0631311009 | GROOVED STUD | Alignment dowel for housing assembly |
